inline bool MacroAssembler::is_calculate_address_from_global_toc_at(address a, address bound) {
const address inst2_addr = a;
const int inst2 = *(int *) a;
// The relocation points to the second instruction, the addi.
if (!is_addi(inst2)) return false;
// The addi reads and writes the same register dst.
const int dst = inv_rt_field(inst2);
if (inv_ra_field(inst2) != dst) return false;
// Now, find the preceding addis which writes to dst.
int inst1 = 0;
address inst1_addr = inst2_addr - BytesPerInstWord;
while (inst1_addr >= bound) {
inst1 = *(int *) inst1_addr;
if (is_addis(inst1) && inv_rt_field(inst1) == dst) {
// stop, found the addis which writes dst
break;
}
inst1_addr -= BytesPerInstWord;
}
if (!(inst1 == 0 || inv_ra_field(inst1) == 29 /* R29 */)) return false;
return is_addis(inst1);
}
bool is_immediate_pair(inst_t* instp) {
// find out if instp points to lis followed by ori/addi/load/store
inst_t i1 = instp[0];
if (!is_lis(i1)) return false;
fint reg = RT(i1);
inst_t i2 = instp[1];
return
is_ori(i2) && RA(i2) == reg && RS(i2) == reg
|| is_addi(i2) && RT(i2) == reg && RS(i2) == reg
|| is_load_store_immediate(i2) && RA(i2) == reg;
}
